Tentukan titik potong antara garis x+y=5 dan 2x-y=1

x + y = 5
x = 5 - y............(1)

2x-y = 1
x = (1 + y) /2 .............(2)

x1 = x2
5 - y = (1+y)/2
10 - 2y = 1 + y
9 = 3 y
y = 9/3 = 3

2x - 1 = 5 - x
3x = 6
x = 2

titik potong = (2,3)